[stable27] fix: separate creation of browser notifications and sounds from Vue rendering

[backportbot[bot]]

Backport of #1947

Warning, This backport's changes differ from the original and might be incomplete ⚠️

Todo

• [x] Review and resolve any conflicts

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[nickvergessen]

/compile /